<template>
    <div class="helper">
        <span class="left">{{unFinishedTodoLength}} items left</span>
        <span class="tabs">
            <span
                v-for="state in states"
                :key="state"
                :class="[state, filter === state ? 'actived' : '']"
                @click="toggleFilter(state)"
            >
                {{state}}
            </span>
        </span>
        <span class="clear" @click="clearAllCompleted">Clear completed</span>
    </div>
</template>

<script>
export default {
    props: {
        filter:{
            type: String,
            required: true,
        },
        todos: {
            type: Array,
            required: true,
        }
    },
    data(){
        return {
            states: ['all','active','completed']
        }
    },
    methods:{
        toggleFilter(state){
            this.$emit('togole',state)
        },
        clearAllCompleted(){
            this.$emit('clearAllCompleted')
        }
    },
    computed:{
        unFinishedTodoLength(){
            return this.todos.filter(todo => !todo.completed).length;
        }
    }
}
</script>

<style lang="stylus" scoped>
.helper
    font-weight 100
    display flex
    justify-content space-between
    padding 5px 0
    line-height 30px
    background-color #ffffff
    font-size 14px
    font-smoothing antialiased
.left, .clear, .tabs
    padding 0 10px
.left .clear
    width 150px
.left
    text-align center
.clear
    text-align right
    cursor pointer
.tabs
    width 200px
    display flex
    justify-content space-between
    *
        display inline-block
        padding 0 10px
        cursor pointer
        border 1px solid rgba(175,47,47,0)
        &.actived
            border-color rgba(175,47,47,0.4)
            border-radius 5px
</style>


